Saw-filing device



(No Model.)

S. UNDERWOOD. SAW FILING DEVICE. No. 453,223. Patented June 2,1891.

Tiff/755555. wQQM 5% "me imam warns on, mmo umu, wAsmNGTcn n c ITED- STATES PATENT OFFICE.

SAMUEL UN DERWOOD, OF SUDBURY, MASSACHUSETTS.

SAW-FILING DEVICE.

SPECIFICATION forming part of Letters Patent No, 453,223, dated June 2, 1891.

Application filed February 21, 1891' Serial No. 382,285- (No model.)

To all whom it may concern.-

Be it known that I, SAMUEL UNDERWOOD, a citizen of the United States, residing at Sudbury, in the county of Middlesex and State of Massachusetts, have invented a new and useful Saw-Filing Apparatus, of which the following, together with the accompanying drawlugs, is a specification suificiently full, clear, and exact to enable persons skilled in the art to which this invention appertains to make and use the same.

The object of my present invention is to provide an efficient andconvenient means for guiding the file when filing a saw by hand; also, to provide a file-guiding appliance having facilities for adjustment to give various degrees of lateral or vertical inclination for varying the degree of flem or bevel on the saw-teeth; also, to afford facility for varying or adjusting the position of the file rotatively in relation to the guiding appliances for giving different degrees of pitch for the teeth of difierent saws. These objects I attain by the mechanism explained in the following description, and illustrated in the drawings, in which Figure l is a side view of my improved sawliling appliance. 'Fig. 2 is a plan view of the. same. Fig. 3 is a transverse section through the file and guide -ho1ding bar, and Fig. 4 shows a device for an aid in adjusting the file.

Referring to parts, A denotes the saw-supfiortiing clamp, which may be of any suitable B indicates a fiat plate, tablet, or shelf of wood or metal, preferably hinged to the clamp, as at b, or supported in other suitable manner and arranged so as to be adjusted, as desired, to cause the plane of its surface to stand at greater or less inclination in relation to the plane of the saw and longitudinally parallel with the clamp-jaws a a. A brace B, hinged to the shelf and adj ustably retained in a lug O by the clamp-screw O, is in the present instance employed for sustaining and adjusting the shelf; but other suitable means can be used therefor if in any case preferred.

D indicates a collar or hub arranged upon the end of the handle E, that carries the file F. Said collar is provided with a top bar D,

that extends forward above the file, and with a downwardly-extended flange that terminates in a broad bearing-foot or under guiding-shoe G,disposed transversely or substantially at a right angle to the direction of the axis of the file-handle and preferably rounded at its lower end to run easily upon the surface of the table or shelf B. The handle-ferrule 6 is fitted to be rotatable within the collar D, and a thumb-screw H is provided for holding the part firmly at any position therein. The tang of the file is held in the handle by a set-screw f, threaded in the side of the ferrule.

I indicates a straight-edged rod supported on the overhanging top bar D and adjustable to right or left inclination on the thumb-screw J as a center.

K indicates a slotted slide mounted over the bar D, with downwardly-turned sides that are adapted for. supporting the bar I. The thumb-screw J clamps both the slide K and the rod I in position of adjustment. A graduated scale m is preferably engraved on the bar D to assist in placing the slide K. One of the corners or edges of the slide at n serves as a back-stop for the rod I, so that said rod can be placed at equal right or left inclination in relation to the file by bringing the edge of the rod back against one or the other of the corners n, the degree of the angle being governed by the position of the slide K on the bar D. The rod I serves to indicate when in parallel position with the saw (as denoted by the eye) the proper angle at which to place the file for giving the desired transverse bevel to the saw-tooth. The under guide-shoe running upon the plane or surface of the shelf B serves as a guide for the upward or lateral inclination of the file in relation to the saw S, so that all of the teeth will be formed with a uniform bevel or fiem. Rotation of the handle in the collar D to the right or left gives adjustment for more or less pitch or rake of the saw-teeth, and the set-screw II secures the adjustment, so that all of the teeth are filed to a uniform pitch, the shoe G being made sufficiently wide to prevent rolling of the file by its bearing on the surface of the table.

In the operation the table B is adjusted in relation to the plane of the saw so as to give therequired lateral bevel. The file and handle are adjusted rotatively in the collar to give the required rake or pitch, and the rod I is adjusted to indicate the right or left inclination desired. Said rod in its parallel relation to the saw serves as a guide to aid the eye when placing the file in the teeth. When making the stroke, the under guiding-shoe is run back and forth in contact with the tablesurface. If desired,the bottom of the shoe G can be fitted with an anti-friction roll, as indicated by dotted lines in Fig. 3. This guiding apparatus does not interfere With handling the file, and it can be dropped into any tooth with a similar hand movement and as readily as can a file Without the attachments.

By the aid of my improved saw-filing apparatus a person who is unaccustomed to filing saws is enabled, after slight instruction as to how to set the bevels, to readily file a saw accurately and in a manner to insure good cutting qualities. The appliance is a great couvenience and help in the operation, and in a great measure prevents the formation of irregular teeth and the destruction of saws by improper or careless filing.

Toassist in adjusting the file, a small plate.

Y, having a straight edge 10 and V-shaped recess 0), can be employed. By placing the straight edge 10 of the plate on the table and the bottom of the shoe G on the same plane and laying the file into the V-recess the file readily assumes a central position. The thumb-screw H can then be tightened for holding it in place. Several plates the recesses 41 in which have right or left inclination in a greater or less degree can be employed for thus gaging the position of the file for right or left pitch to any standard.

or means for holding the same at adjusted position, in combination with the file, the under guiding-shoe G, and the table or shelf B,

substantially as and for the purpose set forth.

3. The adjustable bevel guide-rod I, supported, in connection with the file-handle, by an arm D, overhanging the file, in combination with the file F, the adjustable slotted slide K, having the supporting-angles 'n, and set-screw L, in connecting said rod and slide with the overhanging arm, substantially as and for the purpose set forth.

l. The saw-filing appliance consisting of the collar D, having the under guide-shoe G and overhanging arm or top bar D, the bevel guide-rod I, and slide K, mounted on said top bar, and the set-screws L and H, in combi nation with the file, the file-handle having its end or ferrule rotatably supported in said collar, and the adjustable table or shelf on the plane of which said under guide runs, all substantially as and for the purpose set forth.

Witness my hand this 19th day of February, A. D. 1891.

SAMUEL UNDERYVOOD.

Witnesses:

CHAS. II. BURLEIGH, ELLA P. BLENUS. 

